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1990
January January; 31 (1): 1 - 216	February February; 31 (2): 229 - 395	March March; 31 (3): 411 - 600
April April; 31 (4): 607 - 780	May May; 31 (5): 787 - 997	June June; 31 (6): 999 - 1193
July July; 31 (7): 1195 - 1415	August August; 31 (8): 1419 - 1656	September September; 31 (9): 1659 - 1928
October October; 31 (10): 1929 - 2200	November November; 31 (11): 2201 - 2481	December December; 31 (12): 2483 - 2595